高中英语必修3 Unit 4 Reading How Life Begin on the Earth 教学设计
教学目标：
1.让学生了解地球的形成和发展
2.让学生体会并掌握各种阅读技能和技巧
3.通过文章学习使学生认识地球对人类的重要意义，增强保护地球的意识。
教学重点和难点：
1，通过阅读了解地球的发展历程
2，掌握不同的阅读技巧，提高阅读能力
教学过程：
Step 1 Lead-in
Let students do a puzzle ---------the earth
A puzzle
It looks like a ball but you can’t play,
It is our home but so big,
It is round but we usually think it is flat.
It moves anytime but no one feels.
设计说明：展示该谜语，并让学生齐读，然后猜出答案--地球。利用齐读的方式使学生精神振奋，通过猜谜语激发学生的兴趣导入新课。
Step 2 Pre-reading
A. Let students enjoy the beauty of the earth.
B. Questions:
1, How did the earth come into being?
2, In China, there are some stories about the beginning of life.
Do you know? （Pangu & Nuwa）
设计说明：通过图片让学生感受地球，产生热爱地球家园的体验，同时让学生产生了疑问，地球是怎么形成的，顺利过渡到下一部分。
Step 3 Fast-reading
1, Let students read the text quickly and then answer the following questions.
(1) According to the text, how did the universe begin?
(2) What is the fundamental to the development of life?
(3) Where did life first begin, on the land or in the sea?
(4) Which kind of animal has become the most important animals on the planet today?
设计说明：设计几个较为简单却有关全局的问题，让学生带着问题快速搜索所需信息，锻炼学生快速阅读的能力。让学生迅速把握文章的脉络，为接下来的仔细阅读活动打下基础。
2, Let the students read the text again and then finish the following exercise
Para1 a, the development of life
Para2 b, the important of water
Para3 c, the most important animals on the planet
Para4 d, the formation of the Earth
Para5 e, the “Big Bang”
设计说明：在上一活动的基础上，通过此连线题进一步考察学生在规定时间内把握语篇大意和各段中心大意的能力。
Step 4 Careful-reading
1, Analyzing Read the text and fill in the blanks
How life began on the earth
设计说明：在学生对文章的内容已经有了比较全面的了解后，用图表的方式让学生重新构建文章的主要内容。形式简单、明了，便于知识的掌握和系统化。
2, Reading and answer the following questions.
1. Why was the earth different from other planets?
2. Why did the plants grow before the animals came?
3. Why is it wrong in films and stories to show dinosaurs and people together?
4. What problem is caused by human beings?